3 Hard Drive Related Questions

I don't know if this is the right section for this or not.  If not, I apologize. 

I bought my DS rig with a 500 gig WD Caviar Blue, and I want to add a 1TB Caviar Black (already purchased).

Now... I know some people on the forum favor having just a 500 gig for the primary drive, but since a Black is faster (and supposedly less susceptible to wear and tear) than a Blue, I would think I should use the Black as the boot drive instead, even though it's a 1TB.  Is there any reason not to do that?

And can you clone data from a 500 gig to a 1TB?  This may be a "duh" question, but I've never done it before.

While I'm at it, another question, I have Windows 7, and I notice even when the computer is just sitting around doing nothing it accesses the HD at least once a second.   Is that normal?   I know there's always OS stuff running in the background but it seems like it would excessive long term wear on the drive considering I like to leave my computer running for extended periods.  It's done that since the day it came out of the box, so I didn't pick up a virus from the net.  My XP machine doesn't do that, but I'm new to Win7.   What could it possibly be doing that needs the HD constantly while idle?

I was originally going to buy a 500, but the 500 gig was 65 dollars, while a 1Tb was 95 so I went with the 1TB.  I do have a lot of games, and I do some video converting now and then, and FRAPS capturing, so it will be nice to to have to worry about space.

Thanks for the link to the cloning.  I think I remember seeing you post it before but if I bookmarked it, it's on the old computer.  It should prove invaluable.

I do have Avast! on here, but if memory serves, the HD already did that out of the box, before I installed anything myself.   Also my old comp has Avast! and even the C: drive will eventually power down due to idleness if I leave it doing nothing for an hour or so, so it's not that. *shrug*  I'm not that worried about it, it just seemed unusual to me.  Also the blindingly bright blue LED flashes make it hard to ignore. lol

Thanks.